He said: "We urge all Arab and international parliamentarians to condemn and denounce this crime and to secure the release of Aziz Dweik and all jailed ministers and lawmakers."

Israel detained eight members of the Hamas-led government and 20 MPs on 29 June. Palestinians called that an act of war.

The detentions followed the capture of an Israeli soldier by Palestinian militants in June.

An Israeli army spokesman, confirming Mr Dweik's detention to Reuters news agency, said: "Since Hamas is a terrorist organisation, he is a target for arrest."

Israeli forces had twice previously surrounded Mr Dweik's home but had not arrested him.

Mr Dweik's wife told Reuters on Saturday: "We were sitting home peacefully, normally. Then we heard knocking on the door.

"He went down because the army was there. He opened the door. They saw him in his pyjamas and asked him to go with them."

Red Cross request

Israeli soldiers and tanks moved back into the south of the Gaza Strip three days ago, conducting searches for its detained soldier, Cpl Gilad Shalit.

Seventeen Palestinians have been killed, mainly in air strikes, in that time.

On Saturday, Hamas issued a statement rejecting a Red Cross request for a visit to Cpl Shalit, saying it was "not appropriate at a time when more than 10,000 Palestinian families are denied to visit their prisoners".

Israeli Cabinet minister Ophir Pines said: "We allow people to see Palestinian prisoners... people know where they are and we allow access by international organisations".